Insulator.



No. 675,6l5.- Patented lune'4, I90l. J. M. ANDEBSEN &. A. ANDERSON.

INSULATOR.

(Application filed Jan. 31, 1901.)

(No Model.)

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UNiTnn STATES PATENT OFFICE.

JOHAN M. ANDERSEN AND ALBERT ANDERSON, OF BOSTON, MASSACHUSETTS.

INSULATOR.

SPECIFICATION forming part of Letters Patent No. 675,615, dated June 4, 1901.

Application filed January 31,1901. Serial No. 5,407. (No model.)

T0 at whom it may concern:

Be it known that we, J OHAN M. ANDERSEN and ALBERT ANDERsON,citizens of the United States, residing in Boston, in the county of Suffolk and State of Massachusetts, have invented an Improvement in Insulators, of which the following description, in connection with the accompanying drawings, is a specification, like letters on the drawings representin g like parts.

This invention relates to an insulator especially designed and adapted as a support for the third rail of electric-railway systems.

The invention has for its object to provide a simple, inexpensive, and efficient insulator for the purpose specified.

The particular features of the invention will be pointed out in the claims at the end of this specification.

Figure 1 is a section and elevation of an insulator embodying this invention, and Fig. 2 a plan view of the insulator shown in Fig. 1.

The insulatorherein shown is provided with a metal base a, having suitable lugs or feet I) for attachment to the ties of the railway, the said base having a top plate 0, from which projects upward an annular flange d, which forms a socket or chamber for the reception of a stud or projection 6, depending from a metal plate or chair f, upon which rests the third rail or conductor g to be insulated. The stud or projection e is preferably made hollow and is closed at its lower end by a disk h. The metal chair f and the rail g resting upon it are electrically separated from the metal base a by insulating material which is interposed between the metal chairandits stud c and the top plate 0 and flange d of the metal base and which preferably also covers the flange d on its outer side. The insulating material referred to may be molded in one piece in the form of a cup 1?, havingadepending lipj, the said cup being fitted into the socket formed by the top 0 and inwardlyprojecting flange cl of the metal base, the bottom 7.; of the insulating-cup beinginterposed between the top plate 0 and the disk h. The chair f is preferably provided with a substantially small annular lip or flange l, which depends from the under side of said chair and forms with the stud c an annular groove m, into which the upper portion or rim of the insulating cup is fitted. The chairf may be provided with one or more additional depending lips or flanges n, which are designed to shed water. The depending lip j on the insulating-cup may and preferably will be made long enough to cover the flange cl and rest upon a shoulder 0 on the metal base a.

The metal chair f, the base a, and the interposed cup of insulating material may be firmly secured together by means of layers of sulfur or other suitable cementitious substance, (indicatedby heavy black lines 1; q,) which sulfur is applied in a molten state. The conducting-rail is retained on the chair f, as herein shown, by a lug or ear r, integral with the chair, and by a lug or ear .9, which is provided with a shank t, extended down through a hole in the chair on the side opposite to the lug or ear r and retained by a cotter-pin u or other suitable means. The lugs or ears 1 3 project above the chair a sufficient distance to leave a space for vertical movement of the chair without corresponding movement of the third rail, which movement in a downward direction is due to the weight of the cars.

The insulator herein shown is simple, inexpensive, and highly efficient in operation.

\Ve claim- 1. In an insulator of the class described,the combination with a metal base provided with a top and an upwardly-extended flange forming a socket, of a rail-supporting chair having a depending stud extended into said socket, and insulating material interposed between said chair and its stud and the said metal base and its upwardly-projecting flange, substantially as described.

2. In an insulator of the class described,the combination with a base provided with a socket in its upperend, a rail-supporting chair provided with a depending stud extended into said socket, and a cup of insulating material located in said socket between said base and chair and having a depending lip enveloping the wall of said socket, substantially as described.

3. In an insulator of the class described,the combination with a base provided with a socket in its upper end, a rail-supporting chair provided with a depending stud extended into said socket, and a cup of insulating material located in said socket between said base and chair, substantially as described.

4. In an insulator of the class described,the

combination with a'base provided with a top and an upwardly-extended flange forming a socket, a rail-supporting chair having a depending stud extended into said socket, and i a smaller lip or flange forming With said stud an annular groove on the under side of said i chair, and a cup of insulating material interposed between said stud and flange and provided with a depending lip covering the outer side of said flange, the rim of said insulatingcup extending into the groove on the under side of the said chair, substantially as described.

In testimony whereof We have signed our names to this specification in the presence of two subscribing Witnesses.

JOHAN M. ANDERSEN. ALBERT ANDERSON.

Vitnesses:

JAs. H. CHURCHILL, J. MURPHY. 

